366 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 85 



gurated. There is usually a subperipheral dark spiral zone a little 

 more pronounced than those on the spire. The rest of the base is 

 marked like the spire. The inside of the aperture varies from flesh- 

 color to brown. In one race there is a dark reel dish-brown band im- 

 mediately within the outer lip on the inner peristome ; the outer edge 

 of the inner peristome is usually paler and shows the spiral bands of 

 brown more or less conspicuously, depending upon the development 

 of this element. Nuclear whorls 2, inflated, strongly rounded, form- 

 ing a blunt apex. Suture with a conspicuous brown zone. Post- 

 nuclear whorls w^ell rounded, marked by axial ribs which vary con- 

 siderably in strength. At more or less regular intervals these riblets 

 are gathered into tufts at the summit, which likewise vary in strength 

 from broad coarse denticles to slender, short toothlike elements. The 

 spiral scultpure is as variable as the axial, and usually varies with it; 

 that is, when the axial sculpture is feeble, the spiral is likewise so; 

 when the axial sculpture is strong, the spiral is likewise. Suture well 

 constricted. Periphery well rounded. Base moderately long, well 

 rounded, narrowly openly umbilicate, the widths of the umbilicus 

 being rather constant for the race in question, marked by the con- 

 tinuation of the axial riblets and spiral threads. Aperture oval; 

 peristome double; the outer of variable width, sometimes scarcely 

 extending beyond the inner, at others rather conspicuously expanded. 

 These characters appear to be constant in the different races. The 

 outer peristome is more or less scalloped at the edge, and this scallop- 

 ing varies in extent; in some races it extends over the major portion 

 of the outer and basal lip, and even the anterior portion of the inner 

 lip; while in others it may be restricted to the angle of the inner 

 and basal lip; the outer peristome is a little more expanded as a rule 

 at the posterior angle, but it does not form a conspicuous auricle at 

 this place; the outer peristome may be fused with the preceding whorl 

 at the parietal wall ; it may be appressed to it or entirely free from 

 it. In some of the races this character appears to be constant, while 

 in others it varies from one extreme to another. The inner peristome 

 is also expanded, but less so than the outer, and slightly i-eflected, 

 usually a little broader on the outer lip than the inner or parietal. 

 Operculum paucispiral with submarginal nucleus, the outer surface 

 covered with a fine thin granular calcareous deposit. 



Dr. de la Torre has examined Pfeiffer's type of this species in 

 the British Museum and based the following notes thereon: 



"A worn specimen without o])erculum, very elongate, nearly entire, 

 partly calcined, but it is possible to see that it belonged to the orange 

 or reddish colored variety. It measures: Length, 20.0 mm; diameter, 

 7.0 mm; aperture length, 5.0 mm; diameter, 4.0 mm. The label 

 states that it was received from Cumings." 



